如图,直线y=﹣x+c与x轴交于点B(3,0),与y轴交于点C,过点B,C的抛物线y=﹣x2+bx+c与x轴的另一个交点为A.
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586307762651136/2590542480646144/STEM/8918d275d7824f70831315a231d5321c.png?resizew=288)
(1)求抛物线的解析式和点A的坐标;
(2)P是直线BC上方抛物线上一动点,PA交BC于 D.设t=
,请求出t的最大值和此时点P的坐标;
(3)M是x轴上一动点,连接MC,将MC绕点M逆时针旋转90°得线段ME,若点E恰好落在抛物线上,请直接写出此时点M的坐标.
![](https://img.xkw.com/dksih/QBM/2020/11/5/2586307762651136/2590542480646144/STEM/8918d275d7824f70831315a231d5321c.png?resizew=288)
(1)求抛物线的解析式和点A的坐标;
(2)P是直线BC上方抛物线上一动点,PA交BC于 D.设t=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c445c974a210f226b143cc74a6dea7c.png)
(3)M是x轴上一动点,连接MC,将MC绕点M逆时针旋转90°得线段ME,若点E恰好落在抛物线上,请直接写出此时点M的坐标.
2020·河南·一模 查看更多[1]
更新时间:2020-11-11 10:55:04
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【推荐1】如图,抛物线
与
轴交于点
和点
,与
轴交于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/198dfe03-9862-426d-a501-a2fb577153e1.png?resizew=343)
(1)求抛物线的解析式;
(2)将
以每秒一个单位的速度沿
轴向右平移,平移的时间为
秒,平移后的
与
重叠部分的面积为
.当
与
重合时,停止平移,求
与
的函数关系式;
(3)点
在抛物线上,当
时,请直接写出点
的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358e2987096a67189bcc2a642da39524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1871fad5b818837f699fc07638deae14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/198dfe03-9862-426d-a501-a2fb577153e1.png?resizew=343)
(1)求抛物线的解析式;
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e561d2a841309b7b6ad119a3f59580d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9721059d158853671eaf19e39769b13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f06687df9e3d738472fe0a9e4b2ec07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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名校
【推荐2】如图,在平面直角坐标系中,抛物线
过点
,且交
轴于点
,
两点,交
轴于点
.
(2)点
是直线
上方抛物线上的一动点,过点
作
于点
,过点
作
轴的平行线交直线
于点
:
①当点P运动到抛物线顶点时,求此时
的面积;
②点
在运动的过程中,是否存在
周长的最大值,若存在,请求出
周长的最大值及此时点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d8de071a9c22c96a59b172d76c127e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2be3ad3dd6803d92df6ff8a80cd35095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65334978b0519b379910dfc4acf8344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①当点P运动到抛物线顶点时,求此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cff7399ecc698e2fb415147c96d0d03.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cff7399ecc698e2fb415147c96d0d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cff7399ecc698e2fb415147c96d0d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐1】(1)如图1,已知正方形
的边长为4,圆B的半径为2,点P是圆B上的一个动点,求
的最小值,
的最小值,
的最大值.
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690330411958272/2690405798535168/STEM/f6ebdad2-8d72-4b9d-b3bb-84268b75cb40.png)
(2)如图2,已知正方形
的边长为9,圆B的半径为6,点P是圆B上的一个动点,求
的最小值,
的最大值,
的最小值.
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690330411958272/2690405798535168/STEM/61359a1c-8d93-4b81-8010-2be8ddea75d5.png)
(3)如图3,已知菱形
的边长为4,
,圆B的半径为2,点P是圆B上的一个动点,求
的最小值和
的最大值.
的最小值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f6dc22197489ce7fa0e7327b4c8c28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9fea2db3a4ba176969a5a7c0e37c6df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d4935b203b8873871607392ce66e7bf.png)
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690330411958272/2690405798535168/STEM/f6ebdad2-8d72-4b9d-b3bb-84268b75cb40.png)
(2)如图2,已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b97a858bcf6998dceb5c9822e82ccd2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6f487f5f00509496bbc6871f98b8d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5093c196b31f186a42cae0f827c2c10.png)
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690330411958272/2690405798535168/STEM/61359a1c-8d93-4b81-8010-2be8ddea75d5.png)
(3)如图3,已知菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f6dc22197489ce7fa0e7327b4c8c28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d4935b203b8873871607392ce66e7bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46e4f8e323a959443e3c9ca4fee5cd5.png)
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690330411958272/2690405798535168/STEM/6440cd15-f908-4bbf-805d-a3e369625270.png)
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真题
解题方法
【推荐2】已知:菱形
和菱形
,
,起始位置点
在边
上,点
在
所在直线上,点
在点
的右侧,点
在点
的右侧,连接
和
,将菱形
以
为旋转中心逆时针旋转
角(
).
(1)如图1,若点
与
重合,且
,求证:
;
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/c0639394761c4c4a94ee4a86628a67fa.png?resizew=159)
(2)若点
与
不重合,
是
上一点,当
时,连接
和
,
和
所在直线相交于点
;
①如图2,当
时,请猜想线段
和线段
的数量关系及
的度数;
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/4256cf0dfde04e7eb138a29a611d894b.png?resizew=177)
②如图3,当
时,请求出线段
和线段
的数量关系及
的度数;
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/00c6bda34fb148a5bf5a2b45d0e177ab.png?resizew=206)
③在②的条件下,若点
与
的中点重合,
,
,在整个旋转过程中,当点
与点
重合时,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d609847e2ff3d64e5a514582c3ead0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788c65ceb0663512e37d68488c8dfc34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d2f1f75b87351d44723eedfc34a93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d493dfab1d8677818b0faddb537e855.png)
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/c0639394761c4c4a94ee4a86628a67fa.png?resizew=159)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfea16ad4071629991d3111589d16fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
①如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34d2f1f75b87351d44723eedfc34a93a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/4256cf0dfde04e7eb138a29a611d894b.png?resizew=177)
②如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cce6f6bf45488ced9895ed73f5e3c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
![](https://img.xkw.com/dksih/QBM/2020/7/28/2515504718667776/2515737093947392/STEM/00c6bda34fb148a5bf5a2b45d0e177ab.png?resizew=206)
③在②的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e719b42d66379fcdb027f8006af1918e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
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解题方法
【推荐1】如图,抛物线y=-x
+4x+5交x轴于A、B(以A左B右)两点,交y轴于点C.
![](https://img.xkw.com/dksih/QBM/2014/4/14/1573719327244288/1573719333314560/STEM/2831efec-1d5a-4375-a7c9-b59edd17112c.png)
(1)求直线BC的解析式;
(2)点P为抛物线第一象限函数图象上一点,设P点的横坐标为m,△PBC的面积为S,求S与m的函数关系式;
(3)在(2)的条件下,连接AP,抛物线上是否存在这样的点P,使得线段PA被BC平分,如果不存在,请说明理由;如果存在,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://img.xkw.com/dksih/QBM/2014/4/14/1573719327244288/1573719333314560/STEM/2831efec-1d5a-4375-a7c9-b59edd17112c.png)
(1)求直线BC的解析式;
(2)点P为抛物线第一象限函数图象上一点,设P点的横坐标为m,△PBC的面积为S,求S与m的函数关系式;
(3)在(2)的条件下,连接AP,抛物线上是否存在这样的点P,使得线段PA被BC平分,如果不存在,请说明理由;如果存在,求点P的坐标.
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【推荐2】如图,在平面直角坐标系中,抛物线
与
轴交于
、
两点,与
轴交于点
.
(2)若点
是抛物线上的一个动点,满足
与
的面积相等
求出点
的坐标;
(3)若点
在第一象限内抛物线上,过点
作
轴于点
,交
于点
,且满足
与
相似,求出点
的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e879263725e299745ff51d3c987ff7c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d57173ef4cd72eb270686875dfd623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8df32c7b23e4ca6360cb78745b50f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf783d3172debc69f963495e5bff78d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcfce0e55a5917c2a07c0269430d3761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f4aa6359e027e952a897435224044db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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